Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Em qual ano Culver saiu?
 ###Tabelas: CREATE TABLE provinces_of_afghanistan (provinces_of_afghanistan_id AUTO_INCREMENT PRIMARY KEY, Province VARCHAR, Map # INT, ISO 3166-2:AF VARCHAR, Centers VARCHAR, Population INT, Area (km²) INT, Language VARCHAR, Notes VARCHAR, U.N. Region VARCHAR) CREATE TABLE season-by-season_results (season-by-season_results_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Games INT, Won INT, Lost INT, Tied INT, Points INT, Winning Pct. % VARCHAR, Goals for INT, Goals against INT, Standing VARCHAR) CREATE TABLE club_representative_appearances (club_representative_appearances_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Nationality / Opponent VARCHAR, Ground VARCHAR, Result VARCHAR, Competition VARCHAR) CREATE TABLE supply-demand_gap (supply-demand_gap_id AUTO_INCREMENT PRIMARY KEY, Country VARCHAR, Uranium required 2006-08 VARCHAR, % of world demand VARCHAR, Indigenous mining production 2006 VARCHAR, Deficit (-surplus) VARCHAR) CREATE TABLE former_members (former_members_id AUTO_INCREMENT PRIMARY KEY, School VARCHAR, Location VARCHAR, Mascot VARCHAR, # / County VARCHAR, Year joined INT, Previous conference VARCHAR, Year left INT, New conference VARCHAR)  
SELECT SUM Year left FROM former_members WHERE Location = culver